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Advanced Cabin Heating And Air Conditioning Systems For Recreational Vehicles
Webasto expanded its portfolio of climate control systems to improve thermal efficiency and integration within the broader automotive data ecosystem for mobile homes.
www.webasto.com
Webasto introduced two compact air heaters and updated rooftop air conditioning units designed for integration into recreational vehicle climate systems. The technical solutions target mobile living applications, offering upgraded power regulation, alternative fuel compatibility, and structural mass reduction.
Technical Specifications of the Low-Emission Cabin Heaters
The Air Top Pro 25 air heater delivers a modulated heating output ranging from a minimum partial load of 0.7 kilowatts (kW) to a maximum of 2.5 kW. The continuously variable output modulation eliminates frequent on-and-off cycling, stabilizing electrical current draw and cabin temperatures. Driven by a brushless motor architecture, the unit increases operational lifespan and efficiency compared to older models like the Air Top 2000 STC. The system operates on diesel, gasoline, or hydrotreated vegetable oil (HVO). An automatic atmospheric pressure sensor enables continuous operation at altitudes up to 5,500 meters. The mechanical design permits installation both within the vehicle interior and as an underfloor configuration to optimize living space.
For lower thermal requirements, the Air Top Go 20 variant provides a heating capacity between 1.0 kW and a maximum boost mode of 2.0 kW. It shares identical external dimensions and the brushless motor concept of the higher-output model but operates exclusively on diesel or HVO. This model will be available in September 2026 as a complete package including a dosing pump, a standard installation kit, and a analog rotary selector.
Integration Architecture and Safety Certification Standards
Both heating units are built to meet automotive functional safety criteria under the ISO 26262 standard and include digital protection mechanism certified against cyber attacks in accordance with ISO 21434.
The control architecture differs by model tier:
- Air Top Pro 25: Integrates with existing vehicle networks via LIN, CAN, and CI-Bus interfaces, enabling direct compatibility with third-party control units from suppliers such as E-T-A, Inomatic, and AL-KO, alongside proprietary ThermoConnect application control.
- Air Top Go 20: Utilizes a single proprietary W-Bus interface for diagnostic and control connectivity.
High-Efficiency Rooftop Air Conditioning Systems
The updated Cool Top Trail rooftop air conditioning series introduces the VN generation, designed around the lower-GWP refrigerant R32. The system features a redesigned internal air delivery unit with reduced length, width, and height profiles to allow installation in narrow corridors or adjacent to interior doors. The structural modifications reduce total system mass; the 28VN variant weighs 31 kilograms (kg), representing a reduction of approximately 4 kg compared to its predecessor.
At launch in October 2026, the units will be offered in 28VN and 36VN configurations, featuring variable-speed inverter compressors that modulate power consumption via remote command limits. Certified for electromagnetic compatibility under the ECE R10 regulation, these air conditioners support operational cooling and heating functions while the vehicle is in motion, provided an adequate onboard power supply is maintained. The series accommodates vehicles up to ten meters in length, providing cooling capacities from 2.0 to 3.6 kW, and incorporates a heat pump circuit operational down to an ambient outside temperature of minus 5 degrees Celsius. The units feature a standard CI-Bus interface for centralized digital system management. The products were demonstrated publicly at booth 13A60 and within a Rocket One S camper vehicle on the FG 13-02 open-air grounds in Duesseldorf.
Additional Context: This section details technical specifications and competitive benchmarking not included in the original product announcement
The performance parameters of the new climate components present distinct variations when benchmarked against standard industry options:
The updated Cool Top Trail rooftop air conditioning series introduces the VN generation, designed around the lower-GWP refrigerant R32. The system features a redesigned internal air delivery unit with reduced length, width, and height profiles to allow installation in narrow corridors or adjacent to interior doors. The structural modifications reduce total system mass; the 28VN variant weighs 31 kilograms (kg), representing a reduction of approximately 4 kg compared to its predecessor.
At launch in October 2026, the units will be offered in 28VN and 36VN configurations, featuring variable-speed inverter compressors that modulate power consumption via remote command limits. Certified for electromagnetic compatibility under the ECE R10 regulation, these air conditioners support operational cooling and heating functions while the vehicle is in motion, provided an adequate onboard power supply is maintained. The series accommodates vehicles up to ten meters in length, providing cooling capacities from 2.0 to 3.6 kW, and incorporates a heat pump circuit operational down to an ambient outside temperature of minus 5 degrees Celsius. The units feature a standard CI-Bus interface for centralized digital system management. The products were demonstrated publicly at booth 13A60 and within a Rocket One S camper vehicle on the FG 13-02 open-air grounds in Duesseldorf.
Additional Context: This section details technical specifications and competitive benchmarking not included in the original product announcement
The performance parameters of the new climate components present distinct variations when benchmarked against standard industry options:
- Altitude Operational Thresholds: The automatic altitude compensation up to 5,500 meters exceeds the standard thresholds of conventional compact diesel heaters, such as the Eberspächer Airtronic S3 Commercial, which typically requires secondary kit installations or software adjustments to operate above 3,000 meters.
- Refrigerant Efficiency and Sustainability: The transition to R32 refrigerant yields a Global Warming Potential (GWP) of 675, which is approximately 68% lower than the R410A refrigerant widely utilized in legacy recreational vehicle air conditioners. R32 also enhances thermodynamic efficiency, allowing a lower refrigerant charge volume per kilowatt of cooling capacity.
- Mass Reduction Benchmarks: At a net weight of 31 kg for a 2.8 kW cooling capacity unit, the system sits at the lower end of the weight spectrum for inverter-driven rooftop RV air conditioners, where average weights for equivalent cooling capacities typically range between 33 kg and 38 kg.
